Eckersley, C. (1985). English commercial practice and correspondance (10th.). Longman.
芝加哥风格引文Eckersley, C. English Commercial Practice and Correspondance. 10th. Middlesex: Longman, 1985.
MLA引文Eckersley, C. English Commercial Practice and Correspondance. 10th. Longman, 1985.
警告：这些引文格式不一定是100％准确.